单选题Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean （）.A lower low waterB high waterC low waterD sea level

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单选题

Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean （）.

lower low water

high water

low water

sea level

参考答案和解析

正确答案： C

解析：暂无解析

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第1题：

Both bridges are switches are being used throughout the Ezonexam LAN. Which of the following statements are true regarding bridges and switches in this network?

(Choose 3)

A. Switches are primarily software based while bridges are hardware based.

B. Switches usually have a higher number of ports than most bridges.

C. Bridges are frequently faster than switches.

D. Bridges define broadcast domains while switches define collision domains.

E. Both bridges and switches forward Layer 2 broadcasts.

F. Both bridges and switches make forwarding decisions based on Layer 2 addresses.

正确答案：BEF
B,E,F

第2题：

RefertotheoutputshownonswitchSW1below：Warning：Spantreeportfaststartshouldonlybeenabledonportsconnectedtoasinglehost.Connectinghubs，concentrators，switches，bridges，etc.toafaststartportcancausetemporaryspanningtreeloops.Usewithcaution.Spantreeports4/1-24faststartenabled.Whatcommandcouldyouentertoreproducethisoutput？

setspantreeportfast4/1-24enable。

第3题：

Which routing algorithm is described below?It is a mechanism in which the sending station determines the route the frame. will follow andincludes the routing information with the flame；bridges read the routing information to determineif they should forward the frame．

A．Fixed Routing

B．Spanning Tree

C．Source Routing

D．Frame. Forwarding

正确答案：C

第4题：

Refer to the output shown on switch SW1 below： Warning： Spantree port fast start should only be enabled on ports connected to a single host.Connecting hubs， concentrators， switches， bridges， etc. to a fast start port can cause temporaryspanning tree loops. Use with caution. Spantree ports 4/1-24 fast start enabled. What command could you enter to reproduce this output？

正确答案:set spantree portfast 4/1-24 enable。

第5题：

共用题干
The World's Longest Bridge

Rumor has it that a legendary six-headed monster lurks in the deep waters of the Tyrrhenian Sea between Italy and the island of Sicily._______(46)When completed in 2010,the world's longest bridge will weigh nearly 300,000 tons一equivalent to the iceberg that sank the Titanic一and stretch 5 kilometers long."That's nearly 50 percent longer than any other bridge ever built."says structural engineer Shane Rixon.
_______(47)They're suspension bridges,massive structures built to span vast water channels or gorges.A suspension bridge needs just two towers to shoulder the structure's mammoth weight, thanks to hefty supporting cables slung between the towers and anchored firmly in deep pools of cement at each end of the bridge.The Messina Strait Bridge will have two 54,100-ton towers,which will support most of the bridge's load.The beefy cables of the bridge,each 1.2 meter in diameter, will hold up the longest and widest bridge deck ever built.
When construction begins on the Messina Strait Bridge in 2005,the first job will be to erect two 370 meter-tall steel towers._______(48)Getting these cables up will be something. It's not just their length一totally 5.3 kilometers一but their weight._______(49)
After lowering vertical"suspender"cables from the main cables,builders will erect a 60- meter一wide 54,630一ton steel roadway,or deck一wide enough to accommodate 12 lanes of traffic.The deck's weight will pull down on the cables with a force of 70,500 tons.In return,the cables yank up against their firmly rooted anchors with a force of 139,000 tons一equivalent to the weight of about 100,000 cars. Those anchors are essential._______(50)

_______（49）
A:Some environmentalists are against the project on biological grounds.
B:What do the world's longest bridges have in common?
C: If true ,one day you might spy the beast while zipping（呼啸而过）across the Messina Strait Bridge.
D:They're what will keep the bridge from going anywhere.
E:The second job will be to pull two sets of steel cables across the strait,each set being a bundle of 44,352 individual steel wires.
F: They will tip up the scales at 166,500 tons一more than half the bridge's total mass.

答案：F

解析：

本空前文提到：传说，在意大利和西西里岛间的第勒尼安海的深处，潜伏着一头神奇的六头怪兽。选项C中有一个关键词beast，与第一句的monster相呼应。由此可以判断出与之匹配的选项是C：如果这是真的，有一天你可能在飞驶过墨西拿海峡桥时窥视到这头怪兽。所以选项C是正确答案。
本空前文提到：这座桥桥长约5 000米，桥的结构工程师雪恩?里克森说：“它比有史以来最长的桥还长出约50%。”而后文的话题有所转移：它们都是吊桥，有着巨大的构架，横跨航道或峡谷间的巨大水域。这说明本空的内容应该起到一个很好的衔接上下文的作用，尤其要包含将本文主要讲的桥和其他桥进行比较的内容，由此可以判断出与之匹配的选项是B：那么，世界上最长的这些桥之间有什么共同点呢？所以选项B是正确答案。
本空前文提到：墨西拿海峡桥的建造开始于2005年，那时要做的第一项工作是竖立起两座370米高的铁塔。本空后文又提到：把这些钢缆举起来很不容易。该空后所提的这些钢缆应该出现在所填句中并且顺承上文。由此可以判断出与之匹配的选项是E: 第二项工作将是在海峡两端拉起两套钢索，每一套绳索由44 352根单独的钢缆组成。所以选项E是正确答案。
本空前文提到：这不仅仅体现在钢缆很长（共有5 300米），而且也体现在它们的重量。空前一句的重点落在重量这个概念上，所以下一句应该围绕桥的重量展开说明。由此可以判断出与之匹配的选项是F：它们将重达166 500吨，这个重量已超过了桥总重量的一半。所以选项F是正确答案。
在做本题前，挑出剩下的两个选项A和D。本空前文提到：这些固定物是很必要的。由于选项A将话题转向环保主义者，而文章结尾句一般不提出新话题，加之通过内容判断，选项D中的they应该指的是上一句的固定物，上一句说的是其重要性，下一句说其功能，是对上一句观点的支持。所以选项D是正确答案。

第6题：

UPSR protection switching is initiated by (), while BLSR is initiated by ().

A. the K1 SONET byte； the K2 SONET byte

B. the K2 SONET byte；the K1 SONET byte

C. transmitter switching；receiver detection

D. Line Overhead bytes；Path Overhead bytes

E. Path Overhead bytes；Line Overhead bytes

参考答案：E

第7题：

Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean ______.

A.lower low water

B.high water

C.low water

D.sea level

正确答案：A

第8题：

When comparing and contrasting the similarities and differences between bridges and switches, which of the following are valid statements? Choose all the valid answer choices)

A. Bridges are faster than switches because they have fewer ports.

B. A switch is a multiport bridge,

C. Bridges and switches learn MAC addresses by examining the source MAC address of each frame. received.

D. A bridge will forward a broadcast but a switch will not.

E. Bridges and switches increase the size of a collision domain.

F. None of the above statements are true.

正确答案：BC
B,C 解析：Explanation:
Both bridges and switches build the bridge table by listening to incoming frames and examining the source MAC address in the frame.

Switches are multiport bridges that allow you to create multiple broadcast domains. Each broadcast domain is like a distinct virtual bridge within a switch.

Incorrect Answers:
A. Switches are generally faster than bridges. Bridges also do not necessarily have fewer ports than switches.

D. Both bridges and switches will forward broadcast and multicast traffic, assuming that the traffic remains in the same VLAN.

E. The use of VLANs in a switch can decrease the size of the collision domain, by creating additional, smaller collision domains.

第9题：

Which of the following are true regarding bridges and switches?（）

A、Bridges are faster than switches because they have fewer ports.
B、A switch is a multiport bridge.
C、Bridges and switches learn MAC addresses by examining the source MAC address of each frame received.
D、A bridge will forward a broadcast but a switch will not.
E、Bridges and switches increase the size of a collision domain.

正确答案:B,C

第10题：

UPSR protection switching is initiated by （）, while BLSR is initiated by （）.

A、the K1 SONET byte； the K2 SONET byte
B、the K2 SONET byte；the K1 SONET byte
C、transmitter switching；receiver detection
D、Line Overhead bytes；Path Overhead bytes
E、Path Overhead bytes；Line Overhead bytes

正确答案:E

Clearances of bridges and overhead cables below Bonneville D

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